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<head><meta charset="utf-8"><title>Undecidable type checking in Swift · wg-formal-methods · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/183875-wg-formal-methods/index.html">wg-formal-methods</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/183875-wg-formal-methods/topic/Undecidable.20type.20checking.20in.20Swift.html">Undecidable type checking in Swift</a></h3>

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<a name="205851949"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/183875-wg-formal-methods/topic/Undecidable%20type%20checking%20in%20Swift/near/205851949" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Xavier Denis <a href="https://rust-lang.github.io/zulip_archive/stream/183875-wg-formal-methods/topic/Undecidable.20type.20checking.20in.20Swift.html#205851949">(Aug 03 2020 at 21:57)</a>:</h4>
<p>Slightly OT but figured I shared it since it might interest some people here :) </p>
<p><a href="https://forums.swift.org/t/swift-type-checking-is-undecidable/39024/2">https://forums.swift.org/t/swift-type-checking-is-undecidable/39024/2</a></p>
<p>Undecidable constraint solving in Swift by encoding semigroup word problems into swift protocols</p>



<a name="205934847"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/183875-wg-formal-methods/topic/Undecidable%20type%20checking%20in%20Swift/near/205934847" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Félix Fischer <a href="https://rust-lang.github.io/zulip_archive/stream/183875-wg-formal-methods/topic/Undecidable.20type.20checking.20in.20Swift.html#205934847">(Aug 04 2020 at 17:24)</a>:</h4>
<p>Cool!</p>



<a name="205934872"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/183875-wg-formal-methods/topic/Undecidable%20type%20checking%20in%20Swift/near/205934872" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Félix Fischer <a href="https://rust-lang.github.io/zulip_archive/stream/183875-wg-formal-methods/topic/Undecidable.20type.20checking.20in.20Swift.html#205934872">(Aug 04 2020 at 17:24)</a>:</h4>
<p>I used to be part of the Swift community before discovering how cool Rust is :)</p>



<a name="205934944"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/183875-wg-formal-methods/topic/Undecidable%20type%20checking%20in%20Swift/near/205934944" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Félix Fischer <a href="https://rust-lang.github.io/zulip_archive/stream/183875-wg-formal-methods/topic/Undecidable.20type.20checking.20in.20Swift.html#205934944">(Aug 04 2020 at 17:25)</a>:</h4>
<p>Slava is one of the people I remember the most from there, they keep posting cool stuff like this</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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